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arm64: Hyper-V: vPCI: SPI MSI mapping for gic v3 acpi in arm64

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Microsoft Azure Hyper-V uses SPI to map MSI in ARM64, instead of
using LPI IDS. To enable that we need to have gic registered with
ACPI_MSI_XREF and gic acpi to map SPI for MSI.

This is the 1st of the three patchs to enable Hyper-V vPCI support
in arm64.

Reviewed by:	andrew, emaste, whu
Tested by:	Souradeep Chakrabarti <schakrabarti@microsoft.com>
Obtained from:	Souradeep Chakrabarti <schakrabarti@microsoft.com>
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D37763
This commit is contained in:
Wei Hu 2023-02-01 15:00:18 +00:00
parent 5c32146723
commit db247798c5
2 changed files with 24 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
sys/arm64/arm64/gic_v3.c
View file

@ -382,6 +382,13 @@ gic_v3_attach(device_t dev)
mtx_init(&sc->gic_mbi_mtx, "GICv3 mbi lock", NULL, MTX_DEF);
if (sc->gic_mbi_start > 0) {
if (!sc->gic_mbi_end) {
/*
* This is to address SPI based msi ranges, where
* SPI range is not specified in ACPI
*/
sc->gic_mbi_end = sc->gic_nirqs - 1;
}
gic_v3_reserve_msi_range(dev, sc->gic_mbi_start,
sc->gic_mbi_end - sc->gic_mbi_start);

18
sys/arm64/arm64/gic_v3_acpi.c
View file

@ -50,6 +50,8 @@ __FBSDID("$FreeBSD$");
#define GICV3_PRIV_VGIC 0x80000000
#define GICV3_PRIV_FLAGS 0x80000000
#define HV_MSI_SPI_START 64
#define HV_MSI_SPI_LAST 0
struct gic_v3_acpi_devinfo {
struct gic_v3_devinfo di_gic_dinfo;
@ -319,7 +321,10 @@ gic_v3_acpi_attach(device_t dev)
err = gic_v3_acpi_count_regions(dev);
if (err != 0)
goto count_error;
if (vm_guest == VM_GUEST_HV) {
sc->gic_mbi_start = HV_MSI_SPI_START;
sc->gic_mbi_end = HV_MSI_SPI_LAST;
}
err = gic_v3_attach(dev);
if (err != 0)
goto error;
@ -330,6 +335,17 @@ gic_v3_acpi_attach(device_t dev)
err = ENXIO;
goto error;
}
/*
* Registering for MSI with SPI rnage, as this is
* required for Hyper-V GIC to work in ARM64.
*/
if (vm_guest == VM_GUEST_HV) {
err = intr_msi_register(dev, ACPI_MSI_XREF);
if (err) {
device_printf(dev, "could not register MSI\n");
goto error;
}
}
if (intr_pic_claim_root(dev, ACPI_INTR_XREF, arm_gic_v3_intr, sc,
GIC_LAST_SGI - GIC_FIRST_SGI + 1) != 0) {